0789 Why So Slangry? (Sleepy and Angry) Nightly Sleep Duration and Efficiency Predict Individual Teens’ Next-Day Reports of Mood

Introduction A majority of American adolescents sleep less than the recommended 8-10 hours per night. Studies indicate that adolescents who are sleep deficient report more emotional and behavioral problems, including greater stress, anger, and anxiety. The purpose of this study was to evaluate daily associations between actigraphic nighttime sleep duration and sleep maintenance efficiency (calculated between sleep onset and sleep offset) and next-day mood (anger, loneliness, happiness) among urban adolescents. Methods Participants were enrolled in the Fragile Families & Child Wellbeing Study, a longitudinal birth cohort of children from 20 U.S. cities. When the children were approximately 15 years old, a sub-sample (N=577) concurrently wore a wrist actigraphic sleep monitor (Actiwatch Spectrum, Philips Respironics) and completed daily diaries that included questions about mood (5-point Likert scales) for one week, from which nighttime sleep measures and next-day self-reported mood were determined. Multilevel models tested the within-person temporal association of nightly sleep duration and sleep maintenance efficiency with next-day feelings of happiness, anger, and loneliness. The models also tested the between-person association of sleep variables and mood. Analyses adjusted for sociodemographic and family characteristics, and weekend/school year. Results Within individuals, on nights when sleep duration was shorter than that individual’s average, next-day anger ratings were higher (p